package day07;

public class VerifcationCode {
    public static void main(String[] args) {
        String code = generateVeriCode(4);
        System.out.println("验证码为："+code);
    }

    public static String generateVeriCode(int len){
        String code = "";
        //……
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
                'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
                '0','1','2','3','4','5','6','7','8','9'};

                for(int i=0;i<len;i++){
                    code += chs[(int) (Math.random()* chs.length)];
        }
                return code;
    }
}
